This book was designed to help people pass their water treatment operator certification exams. This book contains 200 practice exam questions which translates as two full-length practice exams made to replicate the actual exams as close as possible. Along with multiple choice questions, there are many math questions that you will definitely see on the real test. Answer sheets and step-by-step solutions for the math questions are included in the back of the book. This is a highly recommended book if you are planning on taking a certification exam soon. Using practice tests, such as the ones within this book, are proven as an very effective study tool. If you are serious and want to test your knowledge to see if you have what it takes to pass your test, look no further.